A removable partial denture that does not have a palatal or lingual bar, strap or plate connecting both sides of an arch of the partial denture. In addition to the rests and/or clasps, the partial denture is held in position by the shape of the linguoplate, which conforms to the shape of the lingual surface of the teeth and alveolar mucosa, and the shape of a portion of the adjacent gum tissue of the patient.
|
1. A partial denture in the form of an arch for restoring a tooth or teeth which are missing on one side of a dental arch of a patient comprising at least one denture tooth on one side of said arch, said at least one denture tooth being held by a resin material, said resin material being supported by a metal frame work of a metal casting, wherein said metal casting further comprises a linguoplate comprising
a lingual portion, said lingual portion having a shape conformable to a shape of a lingual surface of teeth and alveolar mucosa from a tooth adjacent to said missing tooth or teeth to another tooth on another side of said dental arch of said patient for intimately contacting said lingual surface of said teeth and said alveolar mucosa, the linguoplate extends from near one end of the arch to near another end of the arch;
a tissue portion extending from said lingual portion and having a margin 3-10 mm away from said lingual portion, said tissue portion having a shape conformable to a shape of a portion of a rear gum tissue connecting to said teeth and said alveolar mucosa, so that there is no gap between said teeth and said portion of said rear gum tissue not covered by said linguoplate, and wherein said tissue portion further comprises a protection at said margin and on a side thereof facing said rear gum tissue, so that there is a space between said tissue portion and said portion of said rear gum tissue, when said partial denture is put on said dental arch of said patient; and
said metal casting further comprises rests provided on said lingual portion of said linguoplate for engaging prepared notches on teeth of said patient.
2. The partial denture according to
3. The partial denture according to
4. The partial denture according to
5. The partial denture according to
6. The partial denture according to
7. The partial denture according to
8. The partial denture according to
9. A method of restoring a tooth or teeth which are missing in the upper dental arch of a patient comprising aligning a partial denture as claimed in
10. A method of restoring teeth which are missing in the upper dental arch of a patient comprising aligning a partial denture as claimed in
|
The present invention relates to removable partial dentures containing no lingual bar, and in particular to removable partial dentures containing no palatal bar or lingual bar for restoring teeth on the upper dental arch of a patient.
Removable partial denture structures have been developed through the years to replace teeth which are missing through accident or disease. The conventional lower partial dentures have a major connector which is away from the healthy teeth of the patient, for examples mandibular continuous bar, mandibular lingual bar, mandibular lingual bar with continuous bar, mandibular linguoplate, mandibular continuous bar, creating voids between the teeth and the metal bar or similar structure, which cause a discomfort to the patient's tongue, and it becomes worse when food scrapes are stuck in the voids. The conventional partial dentures for restoring missing teeth on the upper dental arch of the patients have a bar, strap or plate as a major connector which connects the components on one side of the dental arch to the components on the opposite side thereof, for examples anterior-posterior palatal bars, single palatal strap type, U-shaped palatal major connector, and palatal plate-type major connector. The degree of discomfort is even more stronger for a patent wearing the conventional upper partial denture than who wearing the conventional lower partial denture, because the bar, strap or plate connecting both sides of the arch of the upper partial denture are right above the patient's tongue. There is a great need for a more comfortable removable partial denture for restoring teeth which are missing on the lower or, in particular, the upper dental arch of a patient.
The present invention involves a removable partial denture that does not have a palatal or lingual bar, strap or plate connecting both sides of an arch of the partial denture. In addition to the rests and/or clasps, it is held in position by the shape of the linguoplate, which conforms to the shape of the lingual surface of the teeth and alveolar mucosa, and the shape of a portion of the adjacent gum tissue of the patient.
The present invention discloses a partial denture in the form of an arch for restoring a tooth or teeth which are missing on one side of a dental arch of a patient comprising at least one denture tooth on one side of said arch, said at least one denture tooth being held by a resin material, said resin material being supported by a metal frame work of a metal casting, wherein said metal casting further comprises a linguoplate comprising
a lingual portion, said lingual portion having a shape conformable to a shape of a lingual surface of teeth and alveolar mucosa from a tooth adjacent to said missing tooth or teeth to another tooth on another side of said dental arch of said patient for intimately contacting said lingual surface of said teeth and said alveolar mucosa; and
a tissue portion extending from said lingual portion and having a margin 3-10 mm away from said lingual portion, said tissue portion having a shape conformable to a shape of a portion of a rear gum tissue connecting to said teeth and said alveolar mucosa, so that there is no gap between said teeth and said portion of said rear gum tissue not covered by said linguoplate; and
said metal casting further comprises rests provided on said lingual portion of said linguoplate for engaging prepared notches on teeth of said patient.
Preferably, said tissue portion of the partial denture of the present invention further comprises a projection at said margin and on a side thereof facing said rear gum tissue, so that there is a space between said tissue portion and said portion of said rear gum tissue, when said partial denture is put on said dental arch of said patient.
Preferably, the partial denture of the present invention further comprises at least one denture tooth on another side of said arch for restoring a tooth or teeth which are missing on another side of said dental arch of said patient, which are held by a resin material supported by another metal frame work of said metal casting, wherein said another tooth on another side of said dental arch of said patient is a tooth adjacent to said missing tooth or teeth on another side of said dental arch of said patient
Preferably, said lingual portion of said linguoplate of the partial denture of the present invention has a sharp occlusal edge approaching to an occlusal surface of said teeth of said patient, and said lingual portion of said linguoplate does not interfere an occlusion of said teeth of said patient, wherein said projection at said margin of said tissue portion of said linguoplate has a height of 0.5-3 mm.
Preferably, said linguoplate of the partial denture of the present invention contains no bar or strap connecting both sides of said arch.
Preferably, said metal casting of the partial denture of the present invention further comprises one or more clasps for engaging with one or more teeth of said patient.
Preferably, the partial denture of the present invention is for use in the upper dental arch of said patient.
The present invention also provides a method of restoring a tooth or teeth which are missing in the upper dental arch of a patient comprising aligning the partial denture of the present invention with the upper dental arch of said patient, and putting said partial denture on the upper dental arch of said patient, so that said lingual portion of said linguoplate intimately contacts said lingual surface of said teeth and said alveolar mucosa, said tissue portion of said linguoplate covers said rear gum tissue connecting to said teeth and said alveolar mucosa, said rests of said linguoplate are engaged with said notches on said teeth of said patient, and said missing tooth or teeth are restored by said at least one denture tooth, wherein there is a space between said tissue portion and said portion of said rear gum tissue.
A partial denture made according to this invention has a linguoplate which intimately attaches to the teeth and alveolar mucosa, but does not impinge on the portion of the gum tissue, avoiding the discomfort caused by the lingual bar, and the bar, strap or plate connecting both sides of an arch of the partial denture.
Another advantage to this invention is that by not having the palatal or lingual bar, strap or plate connecting both sides of an arch of the partial denture clasps, food cannot become entangled between the metal frame work and the teeth/gum tissue. Further, the abutment teeth preparation is almost eliminated, and the occlusal rest preparation is also minimal.
The partials made according to this invention are made by the conventional method, but preferably using Ti or Ti alloy to cast the metal frame work.
As shown in
As shown in the embodiments of
The method of construction the partial denture of the present invention begins with impressions of the upper and lower dental arches of the patient. The impressions are then poured up in dental stone. On these stone models, metal castings 20 are made and denture teeth 31 and 32 are waxed into position to occlude with the opposing arch. The stone models together with the denture teeth 31 and 32 are waxed into position and are invested in dental plaster in dental flasks. When the plaster is set hard, the flask is placed in boiling water to remove the wax. When the upper part of the flask that contains the denture teeth 31 and 32 is removed from the lower flask that contains the metal casting 20 on the stone model of the patient's dental arch, there is a void where the wax was removed. Into this void is packed the dental resin material 40, and the upper and lower halves of the dental flask are placed in a dental clamp to hold the halves of the dental flask together while the flask and dental clamp are placed in boiling water for a period of time to process the dental resin dental material 40 to the denture teeth 31 and 32 and the metal frameworks 24.
The process of preparing the metal casting 20 includes preparation of the dentition, production of an impression, pouring of a model, waxing of the desired shape, investing the wax pattern, bum-out and heating, melting and casting Ti or Ti alloy, finishing and polishing, and heat treatment. The thickness of the wax is between 0.50 to 0.65 mm.
Lin, Jiin-Huey Chern, Ju, Chien-Ping, Lin, Luh-Yuan
Patent | Priority | Assignee | Title |
11744933, | Dec 09 2015 | SALIVA MANAGEMENT SYSTEMS LLC; SALIVA MANAGEMENT SYSTEMS, INC | Saliva management system |
7357637, | Mar 25 2005 | DYMAS FUNDING COMPANY, LLC, AS ADMINISTRATIVE AGENT | Dental appliance |
8449296, | Mar 25 2005 | DYMAS FUNDING COMPANY, LLC, AS ADMINISTRATIVE AGENT | Dental appliance |
9011144, | Sep 14 2011 | Palatal t-bar | |
9414899, | Jul 28 2011 | System and method for saliva replenishment and control | |
9901429, | Mar 25 2005 | Den-Mat Holdings, LLC | Dental appliance |
RE47917, | Oct 14 2010 | DEAN ULTRATHIN RETAINER COMPANY | Cast orthodontic retainer system |
Patent | Priority | Assignee | Title |
1499243, | |||
2594200, | |||
2748480, | |||
4514173, | Jan 30 1981 | Denture coupling | |
5364269, | Mar 04 1994 | Lab One Enterprises, L.C.; LAB ONE ENTERPRISES, L C | Partial denture |
Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
Date | Maintenance Fee Events |
Nov 05 2008 | M2551: Payment of Maintenance Fee, 4th Yr, Small Entity. |
Sep 11 2012 | M2552: Payment of Maintenance Fee, 8th Yr, Small Entity. |
Nov 21 2016 | M2553: Payment of Maintenance Fee, 12th Yr, Small Entity. |
Date | Maintenance Schedule |
May 24 2008 | 4 years fee payment window open |
Nov 24 2008 | 6 months grace period start (w surcharge) |
May 24 2009 | patent expiry (for year 4) |
May 24 2011 | 2 years to revive unintentionally abandoned end. (for year 4) |
May 24 2012 | 8 years fee payment window open |
Nov 24 2012 | 6 months grace period start (w surcharge) |
May 24 2013 | patent expiry (for year 8) |
May 24 2015 | 2 years to revive unintentionally abandoned end. (for year 8) |
May 24 2016 | 12 years fee payment window open |
Nov 24 2016 | 6 months grace period start (w surcharge) |
May 24 2017 | patent expiry (for year 12) |
May 24 2019 | 2 years to revive unintentionally abandoned end. (for year 12) |